Pre-slit PTFE/Silicone Septa
Description
Chromatography septas can be pre-slit. A pre-slit septum is an ideal choice in applications requiring 20% or more of the sample injection each time from the vial so that suction is avoided. The slit allows ambient gas to equalize the gas in the vial so that a vacuum is not created in the vial from the tight seal around the needle. If coring or clogging from a narrow needle or needle deflection from highly durable septa material is a concern, then choosing a pre-slit septum is a better choice. A PTFE/Silicone with a slitted septum allows for easier needle penetration as well as to release the vacuum that forms when a large volume of sample is withdrawn from a vial. This septum provides chromatographic characteristics similar to that of a septum without a slit except that the ability to withstand exposure to aggressive solvents is slightly lessened. Pre-slit septa are highly recommended for improving injection to injection reproducibility with autosamplers withdrawing greater than 50µL of sample from a 2mL vial, due to possible cavitation (vacuum).
Pre-slit PTFE / Silicone Septum
In order to pierce easily
Diameter: 8mm to 22mm
Thickness: 1mm, 1.5mm, 3mm
Septa Material: PTFE / Silicone
Septa Feature: Pre-slit I or X
Packing: 100pcs/pack, Inner PE bag; Standard Carton o